使用 指定的初始化器 .

It is initialization using Designated Initializers.

基于范围的初始化是gnu gcc扩展.

The range based initialization is a gnu gcc extension.

要将一系列元素初始化为相同的值，请写入[first ... last] = value.这是一个GNU扩展.例如

To initialize a range of elements to the same value, write [first ... last] = value. This is a GNU extension. For example,

 int widths[] = { [0 ... 9] = 1, [10 ... 99] = 2, [100] = 3 };

它不是便携式的.使用-pedantic进行编译时会告诉您.

It is not portable. Compiling with -pedantic with tell you so.

在这里如何工作?
预处理器将它的实际内容替换为#include <asm/unistd.h>(它定义了其他符号常量和类型，并声明了其他函数)，这是基于范围的构造，然后将其进一步用于初始化指针数组.

How does it work here?
The preprocessor replaces #include <asm/unistd.h> with its actual contents(it defines miscellaneous symbolic constants and types, and declares miscellaneous functions) in the range based construct, which are then further used for initializing the array of pointers.